<div id="center_tieude">
    <img src="../../Picture/admin.ico"/>
    <h3><?php echo 'Xảy ra lỗi';?></h3>        
</div> <!--end id center_tieude-->

<div id="timkiem_them">
<div id="timkiem_them">
<form action="" method="post">
    <select name="timkiem_gopy">
        <option value="chude">Tìm theo chủ đề</option>
        <option value="ngay">Tìm theo ngày góp ý</option>
    </select>
    <label style="float:left; margin:10px;">Từ khóa:</label>
    <input style="float:left; margin:10px;" type="search" name="key"/>
    <input style="float:left; margin:10px;" type="submit" name="timkiem" value="Tìm Kiếm"/>
</form>